The 1700 Cascadia earthquake occurred along the Cascadia subduction zone on January 26, 1700, with an estimated moment magnitude of 8.7–9.2. The megathrust earthquake involved the Juan de Fuca plate from mid-Vancouver Island, south along the Pacific Northwest coast as far as northern California. The plate slipped an average of 20 meters (66 ft) along a fault rupture about 1,000 kilometers (600 mi) long. Westen Travels - November 2022, Siletz Bay Oregon | Vincent Easley II

On Jan. 26 in the year 1700, a massive earthquake and tsunami hit our coast from the Cascadia subduction zone. We know it happened because the tsunami traveled all the way to Japan, where written records were maintained and correspond to geologic evidence found on our coast. Such an earthquake WILL happen again and could lead to more than $200 billion in damages. It will cause liquefaction -- turning the ground in some areas into a quicksand-like substance. A tsunami will impact at least 50,000

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At 9:00 pm local time on January 26, 1700, a great megathrust earthquake and resulting tsunami struck the Pacific Northwest. How we know the timing of this event with such precision is a fascinating mystery to unravel. Geologic evidence shows that great earthquakes in Cascadia on average occur every 500 years, demonstrating the importance of increasing earthquake resiliency and preparedness in the Pacific Northwest. | EarthScope Consortium